When Yuuta, Rikka and Shou return to school, they learn that several of their classmates have disappeared and nobody has any memory that they ever existed, or of the kaiju battle. They decide to seek answers from Gridman on the computer in Rikka’s shop, which was going to be closed so Rikka could hang out with her two best friends. Meanwhile Akane takes an interest in what Yuuta is talking about and joins him on the roof for lunch, but doesn’t get far.
Turns out Shinjou Akane is very different from the perfect student Shou made her out to be. She lives in an apartment packed with trash and clay models of kaiju. Turns out she’s the one who’s made some kind of Faustian bargain with Gridman’s enemy, who turns all of her creations into full-size kaiju which then kill people she doesn’t like. She may be talented, but she’s not a good person, and must be stopped.
The suspicious-looking sleepy-eyed man eventually arrives at the junk shop, introducing himself as Samurai Calibur and failing to enter or exit a door without getting caught by his ridiculously long four katanas. He “optimizes” the computer so Rikka and Shou can hear Gridman and see the giant kaiju they’re not aware their cute classmate is making and deploying. Her latest creation is “brought to life” and starts wreaking havoc in much the same way as the first one.
As Akane watches the carnage unfold from the safety of her apartment, Yuuta, Rikka and Shou are nearly flattened by a stray steel beam, but Samurai Calibur demonstrates his prowess by slicing it in two, saving them. They rush to the computer, and because it’s now optimized, Gridman (who is nothing but energy in this universe and needs a human with which to collaborate) provides Yuuta with a “Primal Acceptor” bracelet that lets him customize Gridman to his specs and colors.
The new-and-improved Gridman is lighter and faster, but his Grid Beam is deflected; Akane makes improvements to each kaiju based on the failures of the former ones. Gridman gets beaten up again, but Samurai Calibur joins the battle in the form of a gleaming golden sword, with which Yuuta/Gridman uses to cleave the kaiju in two, destroying it and pissing Akane off royally.
Back at school, Akane’s intended target is unharmed and like everyone else, has forgotten all about the attack. But unlike when he bumped into Akane, sparking her ire, he apologizes after bumping into Yuuta, suggesting perhaps the experience unconsciously made him more courteous.
In any case, I’m sure Yuuta and Akane will be facing off a lot more with their respective weapons. The question is, will the Gridman Alliance ever find out she’s the kaiju-maker, will she reveal it to them when she’s ready to eliminate them once and for all, or can she be convinced to stop this evil, destructive venture? On I watch…